#include <stdio.h>
#include <stdlib.h>
#include <alsa/asoundlib.h>
#include <math.h>
#include "main.h"
double fclip(double value, double start, double end) {
return 0.5 * ( fabs(value-start) + (start+end) - fabs(value-end) );
}
void play(struct user_data_s* data) {
static char* device = "default";
/* snd_output_t* output = NULL; */
int err;
snd_pcm_t* handle;
snd_pcm_sframes_t frames;
short buffer[data->audio_info_save->frames];
for(unsigned long int i = 0; i < data->audio_info_save->frames; i++ ) {
buffer[i] = (short)fclip( 32767.0 * data->mono_channel[i], -32767, +32768 );
}
if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
printf("Playback open error: %s\n", snd_strerror(err));
exit(1);
}
if ((err = snd_pcm_set_params(handle, SND_PCM_FORMAT_S16,
SND_PCM_ACCESS_RW_INTERLEAVED, 1,
data->audio_info_save->samplerate,
1, 500000)) < 0) {
printf("Playback open error: %s\n", snd_strerror(err));
exit(1);
}
for (int i = 0; i < 1; i++) {
frames = snd_pcm_writei(handle, buffer, data->audio_info_save->frames);
if (frames < 0) {
frames = snd_pcm_recover(handle, frames, 0);
}
if (frames < 0) {
printf("snd_pcm_writei failed: %s\n", snd_strerror(err));
break;
}
if (frames > 0 && frames < (long)data->audio_info_save->frames) {
printf("Short write (expected %li, wrote %li)\n",
(long)data->audio_info_save->frames, frames);
}
}
snd_pcm_close(handle);
}